Tree Removal Permits in Hamilton, Ontario: What Homeowners Need to Know

Published March 2026  |  Hamilton Tree Pros  |  7 min read

Hamilton is one of the most tree-rich cities in Ontario. The City has invested significantly in its urban forest — the Cootes to Escarpment EcoPark System alone contains tens of thousands of mature trees — and that investment comes with regulatory protection that affects what homeowners can and cannot do on their own properties.

If you're planning to remove a tree from your Hamilton property, you need to know whether a permit is required before the chainsaw comes out. The penalties for removing a protected tree without authorization are substantial, and "I didn't know" is not a defence that has saved Hamilton homeowners from significant fines.

This guide explains when a permit is required, what the application process looks like, and what to verify before hiring a tree contractor.

Hamilton's Tree By-law: The Basics

Hamilton regulates private tree removal primarily through By-law 10-221, the City of Hamilton Tree Canopy and Woodland Protection By-law. This by-law was significantly amended in recent years to strengthen the City's ability to protect its urban tree canopy as Hamilton's housing development intensified.

The by-law establishes two overlapping frameworks:

• Private tree protection: Regulations governing trees on privately owned residential and commercial land, based primarily on the tree's diameter (DBH — diameter at breast height, measured at 1.4 metres from the ground).
• Woodland protection: Separate, stricter regulations applying to treed areas meeting the definition of "woodland" under the by-law — generally 0.2 hectares or more of land with at least 1,000 trees per hectare. Woodlot regulations affect properties at the urban fringe in particular.

Most urban Hamilton homeowners are primarily affected by the private tree provisions. Properties near Dundas Valley, the Escarpment, or Ancaster's greenbelt areas may also be subject to woodland provisions — and those come with additional complexity.

When a Permit IS Required

Under Hamilton's by-law, a permit is generally required before injuring or removing a tree that meets one or more of the following criteria:

Size threshold: 15 cm DBH or greater

This is the primary threshold for most urban Hamilton properties. Any tree with a trunk diameter of 15 cm or more, measured at 1.4 metres above the ground, is subject to the by-law's permit requirements. For reference: 15 cm DBH is roughly the size of a traffic cone at its base — not a mature tree by any means. Many mid-sized backyard trees that homeowners don't consider "significant" fall above this threshold.

How to measure: Wrap a tape measure around the trunk at 1.4 metres. Divide the circumference by π (3.14). That's the diameter. Alternatively: a trunk you can just barely wrap both hands around is approximately 15–18 cm DBH.

Trees in regulated areas

Beyond the size threshold, permits are required regardless of tree size for removal in certain regulated areas including:

• Environmentally significant areas (ESAs) designated under Hamilton's Official Plan
• Areas within the Niagara Escarpment Planning Area (a separate provincial overlay affecting parts of Hamilton, particularly Dundas and Ancaster areas)
• Woodlands as defined in the by-law
• Regulated waterfront and ravine areas under Conservation Authority jurisdiction (Credit Valley Conservation, Conservation Halton, Hamilton Conservation Authority)

Street trees: always require permission

Trees in the road allowance — between the sidewalk and the road, or on City-owned boulevard areas — are City property, not yours. Removing, injuring, or even substantially pruning a street tree without written City authorization is not a permit situation — it's unauthorized damage to City property. Contact Hamilton's Urban Forestry division before doing anything to a street tree, even one that appears to be in front of your house.

When a Permit is NOT Required

Hamilton's by-law includes exemptions for certain situations. A permit is generally not required for:

• Trees with a DBH under 15 cm (subject to not being in a regulated area)
• Dead trees — however, this comes with an important caveat: you need to be able to demonstrate the tree was dead before removal, and the definition of "dead" is specific. A tree with some dead branches is not a dead tree under the by-law. Get the status confirmed in writing if there's any doubt.
• Trees that pose an immediate danger to life or property — emergency situations where waiting for a permit would create an imminent hazard. Document the emergency conditions thoroughly (photos, written assessment from a qualified arborist) if relying on this exemption. This exemption does not apply to a hazardous tree that has been hazardous for months — it applies to genuinely acute emergencies.
• Trees in a licensed nursery stock operation or orchard in active commercial use
• Trees required to be removed for a building permit, where the building permit process has included review by Urban Forestry

Permit vs No-Permit: Quick Reference

How to Apply for a Tree Removal Permit in Hamilton

1. Confirm the by-law applies to your tree. Measure DBH, identify whether the property is in any overlay area. Hamilton's online mapping tools show ESAs, woodland areas, and Conservation Authority regulated areas.
2. Submit a Tree Removal Permit application to the City of Hamilton. Applications are submitted through Hamilton's permitting system (ServiceHamilton). You'll need to provide the address, tree species, DBH, reason for removal, and often a site sketch showing the tree's location. Fees are typically $100–$400 per tree depending on type and location.
3. Urban Forestry review. City staff may conduct a site inspection or review remotely depending on the situation. For straightforward applications (dead or clearly hazardous trees), review can be fast. For contested removals, review may involve an on-site visit and more extensive assessment.
4. Receive decision. Permits may be granted with conditions — commonly a requirement to plant replacement trees, either on the property or as a payment into the City's tree replacement fund. Denied permits can be appealed.
5. Proceed with removal within the permit validity period. Permits are valid for a specified period. Do not remove the tree before the permit is issued and in hand.

Typical permit timelines

Straightforward applications — clearly dead trees, obvious hazards, minor species — often complete in 2–4 weeks. Complex applications involving significant mature trees, ESA proximity, or contested removals can take 6–12 weeks or longer. Plan accordingly if you're timing removal with construction, planting, or property sale.

Penalties for Removing a Tree Without a Permit

Hamilton's by-law carries fines that have surprised many homeowners. Under By-law 10-221, penalties for removing a tree without authorization include:

• Fines of up to $100,000 per tree for intentional unauthorized removal
• Mandatory replacement plantings — the City can require planting of replacement trees at a ratio that may exceed 1:1, potentially requiring several new trees for each removed without authorization
• Costs of remediation or restoration assessed to the property owner

What to Tell Your Tree Contractor

A reputable tree removal contractor in Hamilton will raise the permit question before quoting the job. But not all do, and the legal responsibility sits with the property owner — not the contractor. Before hiring anyone:

• Ask explicitly: "Does this removal require a permit? Have you pulled permits in Hamilton before?"
• Get confirmation in writing of who is responsible for the permit application if one is needed
• Do not accept verbal assurances that a permit "isn't needed" without understanding why — ask the contractor to explain their reasoning
• Verify the contractor is properly insured (WSIB and general liability). An uninsured contractor on your property creates significant liability exposure, especially for a job that may also carry by-law implications
• If the contractor says it's a dead tree and no permit is needed: ask whether they've documented that assessment. A qualified arborist opinion in writing is the documentation that protects you.